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Ireland and Britain were both separated from the European continent at about this time (c. 12,000 BCE). The first people arrived in Ireland between 7,000-6,500 BCE at Coleraine in the far north. The Mount Sandel Mesolithic Site, discovered at Coleraine in 1973 CE, is the oldest archaeological site in Ireland.
The oldest rocks are metamorphic gneisses which are to be found on Inishtrahull, several miles off Malin Head in Co. Donegal, and elsewhere in the north-west. They originally formed as igneous rocks 1750-1780 million years ago.